Just a little more info, the wiring was done 9 years ago and it all goes back to a location in my living room where the amp will be for the DIY speakers in the garage.
My though will be to interupt that wiring in the garage with a plate amp or two that have speaker level inputs for my mains, allowing me to use the XO and to use the plate amp to power the subs, which we will need if I'm gonna have a kickin sound system in there.

So is this a design for just a bass system for you garage or are you wanting speakers too? I'd say maybe a stock 4pi or Econowave and maybe pair those up with a single or dual THT's. If overall width is an issue you can build the 12" driver version which I believe makes the cab about 15-18" in width. Or if you are willing to slightly elevate your minimum lowend corner your options would open up a bit more.

Ahh, flying the whole thing? Okay. Well, maybe check up on that Anarchy based TH if you want to do the TH route and that goes down to 25hz-ish. I wouldn't complicate the build with a one off TH design, myself but I'd like to see what you come up with if you do.

Parts Express makes these knock down kits.... omg, they have a 15" version now, apparently. Yeesh. I could have used one of these last year.

I think I would second the recommendation of just going to goodwill or some place like that and picking up the biggest old speakers they have. Then you could spend more on the sub. I've been thinking about doing a monster horn sub using cheap drivers in my shop as well since I have something like 25'x40' to work with. A setup like that could make for a pretty enjoyable place to watch a movie with a big group of people.

For a garage, I think it could be a mistake to build "normal" speakers.

In your home theater, you would always be sitting in the same spot, so normal speakers are perfect. But in a garage, you would be kneeling down, standing up, moving from spot to spot. And if you're like me, you would eventually get tired of moving in and out of various audio "sweet spots".

Have you considered speakers that would "fill a room"?
The Bose 301's are designed for something like this and have 8" woofers that offer decent amount of bass. And, they aren't tower speakers. So they would be great mounted up near the ceiling.
They have been around forever, so you can find one of the many generations available on ebay or craigslist pretty easily.

The Bose 901's are very capable, but require being mounted away from the rear wall for the best sound. Also they like to be ceiling mounted, but about 1.5' from the ceiling I think?

The Bose 901's are very capable, but require being mounted away from the rear wall for the best sound. Also they like to be ceiling mounted, but about 1.5' from the ceiling I think?

That's exactly how I have mine mounted. I just modified the floor stands to hang them from the ceiling. They really do work well in the shop. They put out a remarkable amount of "sloppy bass". My shop is ~12,000 ft^3. I'm driving them with a 120 watt per channel Rotel amp.

Yeah I'm using the OEM EQ. I've got about 2' from the pointed end to the wall. I still manage to whack them once in a while with lumber or clamps. At least they're out of skull striking zone. They're sloppy compared to my B&W's in the theater.

Yeah I'm using the OEM EQ. I've got about 2' from the pointed end to the wall. I still manage to whack them once in a while with lumber or clamps. At least they're out of skull striking zone. They're sloppy compared to my B&W's in the theater.

the bose 901 were designed to try to recreate the direct vs. reflected sound of live performances.

the relections provided by the 901 are preferred by many for music, as it makes it sound very spacious/ambient, but for home theater it is a total fail, as it makes dialog slurred/sloppy/unintelligible. this is why no pro theater employs this approach.

jbl experimented with such dual systems, but it didn't really catch on.

The Danley DTS-10 has not been available as a kit for 9 months. It can now only be purchased as an assembled unit.

Many individuals in this forum like the Bill Fitzmaurice Tuba HT front loaded horn. The plans are available for $15 at the BFM site. There are at least 8 build threads in this set of threads. The BFM THT is 3'x3'xyy where yy varies between 24.5" and 36". The THT gives solid response to 22 Hz (its tuning) and then falls off precipitously. A pair would be devastatingly loud. The cost somewhat less than $500 each to build (price includes a separate power amp such as the Parts Express 240w plate amp). You need to check the BFM site for the latest recommended 15" drivers. Previously, it was one of the 15" PE 15" drivers.

There is also the THT LP that is twice as high but as the same internal volume as the original THT. Some individuals have built it because it fits better where they want to put it.

Correction: yy upper bound changed from 48" to 36". On BFM site there are 48 Tuba HT and 60 Tuba HT but they are different beasts.

Many individuals in this forum like the Bill Fitzmaurice Tuba HT front loaded horn. The plans are available for $15 at the BFM site. There are at least 8 build threads in this set of threads. The BFM THT is 3'x3'xyy where yy varies between 24.5" and 48". The THT gives solid response to 22 Hz (its tuning) and then falls off precipitously. A pair would be devastatingly loud. The cost somewhat less than $500 each to build (price includes a separate power amp such as the Parts Express 240w plate amp). You need to check the BFM site for the latest recommended 15" drivers. Previously, it was one of the 15" PE 15" drivers.

There is also the THT LP that is twice as high but as the same internal volume as the original THT. Some individuals have built it because it fits better where they want to put it.

I didn't realize that there was a 48" version. Is there a build with this width?

dbl

Let's all go to the lobby....Let's all go to the lobby........Let's all go to the lobby............To get ourselves a treat!

That plate amp is the exact same one I use to power a single 12" 6th-order sub in the garage...it does the job and is cheap. It was powering two of these 2.9 ohm 12" cabs in series until one died -- used to use them for the low end at my wife's bank Christmas/Halloween parties until an overzealous wanna-be roadie helping me load stepped on the wire (which was stupidly run directly to the voice coil with no terminal plate) and ripped the leads right out of the coil.

The system also has an a/d/s C1500 electronic crossover/bass controller ($50 on eBay) to high-pass the Renkus Heinz and provide some neat controls over the subs. Really allows the system to crank!

I used the PE amp's high-level ins/outs for awhile but it seriously compromised the sound.

Lilmike is belting out a nice Tapped Horn alternative to the THT for my basement family room system that would rattle your garage. The shopsub that radman12 linked to in post #8 is an awesome affordable option that is ready to build.